Here is the new backtrace :

Application: Bilbo Blogger (bilbo), signal: Segmentation fault
[Current thread is 0 (LWP 8253)]

Thread 2 (Thread 0x7f55d4c8b910 (LWP 8274)):
#0  0x00007f55e750805d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f55e77772b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f55e776d412 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007f55e7776285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f55e750357a in start_thread () from /lib/libpthread.so.0
#5  0x00007f55e59c314d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f55ea664750 (LWP 8253)):
[KCrash Handler]
#5  QString (this=0x7fff9118f990, other=@0x10) at /usr/include/QtCore/qstring.h:711
#6  0x00007f55e8e8ff31 in KBlog::BlogPost::postId (this=<value optimized out>) at /home/hcooh/Applis/bilbo-bloggerbis/src/bilbo/bilbokblog/blogpost.cpp:146
#7  0x00007f55e8e9aac3 in KBlog::GDataPrivate::slotFetchPost (this=<value optimized out>, loader=0x25f4290, feed=<value optimized out>, status=<value optimized out>)
    at /home/hcooh/Applis/bilbo-bloggerbis/src/bilbo/bilbokblog/gdata.cpp:785
#8  0x00007f55e8e98364 in KBlog::GData::qt_metacall (this=<value optimized out>, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff9118fc10)
    at /home/hcooh/Applis/bilbo-bloggerbis/src/build/bilbokblog/gdata.moc:133
#9  0x00007f55e7870dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0x00007f55e31a92f2 in Syndication::Loader::loadingComplete () from /usr/lib/libsyndication.so.4
#11 0x00007f55e31aa39d in Syndication::Loader::slotRetrieverDone () from /usr/lib/libsyndication.so.4
#12 0x00007f55e31aa7ed in Syndication::Loader::qt_metacall () from /usr/lib/libsyndication.so.4
#13 0x00007f55e7870dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0x00007f55e31ac823 in Syndication::DataRetriever::dataRetrieved () from /usr/lib/libsyndication.so.4
#15 0x00007f55e31ad5df in Syndication::FileRetriever::slotResult () from /usr/lib/libsyndication.so.4
#16 0x00007f55e31ad763 in Syndication::FileRetriever::qt_metacall () from /usr/lib/libsyndication.so.4
#17 0x00007f55e7870dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0x00007f55e7eb6722 in KJob::result () from /usr/lib/libkdecore.so.5
#19 0x00007f55e7eb6a9f in KJob::emitResult () from /usr/lib/libkdecore.so.5
#20 0x00007f55e85988c3 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#21 0x00007f55e8598d83 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#22 0x00007f55e8597691 in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#23 0x00007f55e7870dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0x00007f55e8659381 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#25 0x00007f55e8655c33 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#26 0x00007f55e8648a5d in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#27 0x00007f55e864ab7c in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#28 0x00007f55e7870dec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0x00007f55e8565ae7 in KIO::ConnectionPrivate::dequeue () from /usr/lib/libkio.so.5
#30 0x00007f55e8565c0d in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#31 0x00007f55e786b109 in QObject::event () from /usr/lib/libQtCore.so.4
#32 0x00007f55e659169c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#33 0x00007f55e659896e in QApplication::notify () from /usr/lib/libQtGui.so.4
#34 0x00007f55ea0988d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#35 0x00007f55e785bcec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#36 0x00007f55e785c8ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#37 0x00007f55e7884543 in ?? () from /usr/lib/libQtCore.so.4
#38 0x00007f55e40d3dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0x00007f55e40d7568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#40 0x00007f55e40d7690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0x00007f55e78841b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#42 0x00007f55e662464e in ?? () from /usr/lib/libQtGui.so.4
#43 0x00007f55e785a5f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0x00007f55e785a9c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0x00007f55e785cb79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0x0000000000422140 in main (argc=<value optimized out>, argv=<value optimized out>) at /home/hcooh/Applis/bilbo-bloggerbis/src/bilbo/bilbo/main.cpp:57 

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